Can fish in large water tank be raised alive? However, not all fish can be raised in this kind of water tank. Because it is far from the shape of ordinary fish tanks, many equipments can't be installed, and heat preservation and filtration can't be achieved. Only some wide-temperature fish with lax water quality requirements can be raised, such as goldfish, koi fish, tangyu, medaka and so on. If it is tropical fish, it can't be raised in it.

1. Goldfish: Goldfish is a common ornamental fish, and it is no problem to raise it in a big water tank. Because this fish itself evolved from crucian carp, it has certain adaptability to the environment, and is not afraid of cold, even in winter, it will not freeze to death, as long as the water body is not completely frozen.

2, Koi: As a high-grade ornamental fish, Koi is relatively large in size, and there must be enough space in the large water tank to keep it. As a wide-temperature fish, it has strong adaptability to water temperature, can survive in the environment of 5-30 ℃, and is mild in nature, miscellaneous in feeding habits and easy to raise.

3. Tangyu: Tangyu, also known as Baiyun Jinsi, is a unique fish species from southern China. Although it is a national second-class protected animal, it has become extinct in the wild. At present, all the existing species are artificially bred, so it can be raised. Moreover, it is not afraid of cold, and can still live normally at 5 ℃.